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Goniasma
Classification
Phylum:
Mollusca
Class:
Gastropoda
Subclass:
Prosobranchia
Order:
Archaeogastropoda
Suborder:
Archaeogastropoda? - Suborder Murchisoniina
Superfamily:
Murchisoniacea
Family:
Murchisoniidae
Formal Genus Name and Reference:
Goniasma TOMLIN, 1930 [pro Goniospira Girty, 1915 (non Cossmann, 1895, nec Donald, 1902)]
Type Species:
Murchisonia lasallensis WORTHEN, 1890
Images
(Click to enlarge in a new window)
Fig. 191,11. *G. lasallense (Worthen), U.Penn., Ill., X4.
Synonyms
Geographic Distribution
N.Am.-S.Am.-Eu.
Age Range
Beginning Stage in Treatise Usage:
Penn.(U.Carb.)
Beginning International Stage:
Bashkirian
Fraction Up In Beginning Stage:
0
Beginning Date:
323.4
Ending Stage in Treatise Usage:
M.Perm.
Ending International Stage:
Capitanian
Fraction Up In Ending Stage:
100
Ending Date:
259.55
Description
Whorls with smooth slope above angular periphery; labrum with angular sinus that culminates just below periphery in short slit which generates slightly concave, inwardly sloping selenizone; with pair of spiral threads below selenizone, upper one located at or above lower suture; some species with faint indication of siphonal canal.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Gastropoda
Subclass:
Prosobranchia
Order:
Archaeogastropoda
Suborder:
Archaeogastropoda? - Suborder Murchisoniina
Superfamily:
Murchisoniacea
Family:
Murchisoniidae
Formal Genus Name and Reference:
Goniasma TOMLIN, 1930 [pro Goniospira Girty, 1915 (non Cossmann, 1895, nec Donald, 1902)]
Type Species:
Murchisonia lasallensis WORTHEN, 1890
Images
(Click to enlarge in a new window)
Fig. 191,11. *G. lasallense (Worthen), U.Penn., Ill., X4.
Synonyms
Geographic Distribution
N.Am.-S.Am.-Eu.
Age Range
Beginning Stage in Treatise Usage:
Penn.(U.Carb.)
Beginning International Stage:
Bashkirian
Fraction Up In Beginning Stage:
0
Beginning Date:
323.4
Ending Stage in Treatise Usage:
M.Perm.
Ending International Stage:
Capitanian
Fraction Up In Ending Stage:
100
Ending Date:
259.55
Description
Whorls with smooth slope above angular periphery; labrum with angular sinus that culminates just below periphery in short slit which generates slightly concave, inwardly sloping selenizone; with pair of spiral threads below selenizone, upper one located at or above lower suture; some species with faint indication of siphonal canal.